Ancho Pepper-Cherry Sauce

Combine cherries, onion, vinegar, ketchup, brown sugar, water, garlic, chile powder and cumin in a medium saucepan. Bring to a boil over medium-high heat. Reduce heat to low, cover and simmer until the onion is tender, 15 to 20 minutes.

Transfer the mixture to a blender. Remove the center piece of the lid (so steam can escape) ; secure the lid and place a towel over the opening. Process until smooth, about 30 seconds. Add butter and salt; process until smooth.